Tested with git HEAD of xfce4-power-manager (2011/10/25). Ubuntu 11.10.

$ gdb --args bin/xfce4-power-manager --debug --sync
(gdb) break _XError
(gdb) run
[...]
Breakpoint 1, 0xb769bc40 in _XError () from /usr/lib/i386-linux-gnu/libX11.so.6
(gdb) bt
#0  0xb769bc40 in _XError () from /usr/lib/i386-linux-gnu/libX11.so.6
#1  0xb769893d in ?? () from /usr/lib/i386-linux-gnu/libX11.so.6
#2  0xb7699927 in _XReply () from /usr/lib/i386-linux-gnu/libX11.so.6
#3  0xb77ae85f in XRRQueryOutputProperty () from 
/usr/lib/i386-linux-gnu/libXrandr.so.2
#4  0x0805f4c8 in xfpm_brightness_xrand_get_limit (brightness=<optimized out>, 
output=<optimized out>, min=0xbfffed38, max=0xbfffed3c) at xfpm-brightness.c:69
#5  0x0805f8e4 in xfpm_brightness_setup_xrandr (brightness=0x80f39a0) at 
xfpm-brightness.c:199
#6  xfpm_brightness_setup (brightness=0x80f39a0) at xfpm-brightness.c:533
#7  0x080590c3 in xfpm_backlight_init (backlight=0x809bdb0) at 
xfpm-backlight.c:387
#8  0xb78e3fab in g_type_create_instance () from 
/usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#9  0xb78c33cb in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#10 0xb78c6509 in g_object_newv () from 
/usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#11 0xb78c7068 in g_object_new () from 
/usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#12 0x08059328 in xfpm_backlight_new () at xfpm-backlight.c:471
#13 0x0805050a in xfpm_manager_start (manager=0x809bc20) at xfpm-manager.c:543
#14 0x0804e451 in xfpm_start (bus=<optimized out>, client_id=0x0, dump=0) at 
xfpm-main.c:227
#15 0x0804eadf in main (argc=1, argv=0xbffff284) at xfpm-main.c:426

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https://bugs.launchpad.net/bugs/821170

Title:
  xfce4-power-manager fails to start (receives X window system error
  "BadName")

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